code: def test_failure():
      """Tests that backend frameworks and non-critical libraries are not imported."""
      with pytest.raises(ModuleNotFoundError):
          import torch  # noqa: F401
  
      with pytest.raises(ModuleNotFoundError):
          import tensorflow  # noqa: F401
  
      with pytest.raises(ModuleNotFoundError):
          import horovod  # noqa: F401
  
      with pytest.raises(ModuleNotFoundError):
          import accelerate  # noqa: F401
  
      with pytest.raises(ModuleNotFoundError):
          import transformers
  
file_path: ray/python/ray/train/tests/test_minimal.py
imports: import pytest
  import ray
  from ray import train
  from ray.train import ScalingConfig
  from ray.train._internal.worker_group import WorkerGroup
  from ray.train.backend import Backend, BackendConfig
  from ray.train.data_parallel_trainer import DataParallelTrainer
  from ray.train.tests.util import create_dict_checkpoint, load_dict_checkpoint
label_desc: Use image node_id 3 for calling a global function with example usage: test_failure() without return types